Shuttle friction pad and assembly



Dec. 6, 1949 J. E. SEGEE ET AL SHUTTLE FRICTION PAD AND ASSEMBLY FiledDec. 17, 1948 INVENTO 0 a o a I f v WWL ATTORNEYS Patented Dec. 6, 1949James E; Segee; La'wrence; and wilfriiiflf Gbs: selin, Methucn, Mass.,assignorsttflfl S. g &- Shuttle Cor,- Providence; RI -I.", a"corporafiori Bim- Application December 11, 1943; seriaiino'..ss;vesf

4 Claims; (Cl.139---2 1 7) This invention relates to. what are known? asfriction pads such as are used in shuttles for looms, particularly thosein which there is a shuttle block with a threading slot extending downfrom the top to produce an uniform friction or tension on the filling asthe shuttle is picked backa'nd forth at a. very high speed.Such'friction pads are shown in patents to Park, No. 2,087,607; Nova,No. 2,027,752; Tebo, No. 2,107,917"; Tebo, No. 2,152,223; and Tebo, No.2,170,541.

v Near the back of the threading slot, there are two opposed metal padsinto which the filling, yarn slips, and then passesat every pick of theloom. Each pad has anearly fiat face alongv what we will call thefriction or thread side and at the top there are wings each of which atthe" end of a curved edge extend out and back towards and forming partof a holding side. bottom of each pad is a pinhole through which;

a pin passes, the hole being somewhat larger" than the pin to allow eachpad to move ashort' distance transversely of the axis of the shuttle.

At the top, each pad is bent in a'curve outward" or towards and beyondthe holding side in the form of a neck, and from this neck, as now made,

filling side of the other pad.

It is highly desirable that each pad'should be freely but not looselymovable transversely'and' its construction and supports should notpermit oneor both to bind at their top or bottom.

It has been customary to make theears of" U-shape, but, as the bushing.or hole which each enters is round, they have a tendency to bind and thepin hole has been so punched that both its edges are right angles, thusleaving a sharp" edge at the inside and also at the outside rimssometimes with a burr. This constructionhas a'tendency to causethe padto bind on its'bottom' as well as its top bearing.

Our construction prevents binding, and. cutting i.

of the'filling thread but permits the thread'to enter between the padsand to allow the force of the spring toproduce the same pressure at alltimes on the threadl'whether it is running from the'top 0f thethick'p'art'of the yarn package on the bobbin, from the middle, or fromthe bottom.

As the filling thread travelsth'rough between the pads at a very highspeed and as occasionally N ear the;

verynecessarfth'at'there should be a; yielding ofthepa-d's'tra'nsverselyi To accomplishla resilient; action there isusually a spring behind one or bothpadsso' that when a thinspot passes,the

friction wlll not'bel-too"mu'ch reduced' or when a" thick s'p'otpa'sses; there will. be a yielding. The; purpose'i's toproduce' as neanys possible anZunl-' form friction on the yarmandto prevent it fromvunwinding" fromQthe'bObbin too" rapidly at one.

10* time, wherebydt'jmay form a loop whichmay catch onth'e nose of' theshuttle block, and from passihgtoo" rapidlyandtoo" easily out of theshuttle eye, thus making a. weak'spot or. a soft spot inthe clothi A Onthe*oth er'hand;;if thethread is held back too much, whenathick spotpasses between the pads, orj'if 'the'friction and tension on the fillingthreadis too heavylthis may cause a break which is'ii'alsohighlyobjectionable;

Ourin'vention" consists of an improvement in;

each'- pad "whereby the ears at the" top formingf'a;siipportingihead'which engages the top. bearingf or'bushing instead'of'b'eing U-shaped are curved" in acircle towards each' other inalmostian O shape. and of forming the pinhole at the bottom as a tiibe'with" a rounded" edge on the thread. sldeiwhereby the yarn cannot catchon. any part oi'itf thejtub'e"proiectingion the holding side he lowjthe;headand" presenting a tubular contact The bearings at .top'andbottomarecylindrical each presenting; concentric concave to convex races; alled'geswherebinding" mightoccur being,

rounded and;when installed, with a compressionspring between them.

In the drawings Fig. us a sectional elevational view on a" verticalplane extending longitudinally through a shuttle' block" and'with thedifferent positions of the thread when passing through" the friction padas'indic'at'ed;

Fig.2 2 'i's'a reanelevational view of ashuttle" bio k'witiiftwofriction pads" in place.

Fig: 3" is'an"elevationalview, very muchenlarged;showingiasingle'friction pad of our constiuctiofiwitliiparts ofthe topbushing bearing.

andthe bottom pin bearing in position.

4'iisi'an'ielevati'onal View as from theright ofFig'. 3', but.on'afsinaller scalew'ith part of'the shuttle block; pushing, andibearinghead. as well asttheb'arihgflfiil all indicated 5. an; elvatibnallviewfas from.v the. ,back but omitting the threading block-and ofFig;4,"

i 5 I V Figl 6 i's'a sectional elevational view as on a a thin or thickspot appears in the thread, it is 55 vertical plane which extendstransversely through 3 a block with two friction plates but a singlespring.

Fig. 7 is an isometric view as from the friction side of a frictionplate, very much enlarged.

In the drawings S represents a shuttle of a well known type in whichthere is a threading block L which is usually of metal and in which is alongitudinal threading slot 29 which extends down from the toplengthwise: of the shuttle axis. There are near the back of block L, oneon each side of slot 29, oppositely disposed pads F, F,

each of which has at the top a neck 30 and a head 3| which head extendsinto a cylindrical head bearing hole 33 in a bushing 34 fixed in a roundhead hole 31 in one side near the top of the slot 29. Each of these padsF has a holding pin hole 22 near its bottom through which a holding pinP passes in a well known manner.

When there is no thread in the shuttle, the high, narrow friction facesengage each other from near the top to near the bottom. We will callthis side the frictionside and the other side 2| the holding side.

Wings 23, 23 are bent back between the too and bottom each from an edge24 of the face 20 towards the holding side. As shown in Fig. 2, behindeach pad F is a compression spring N which is usually held in place asby a screw 35 which can be turned to increase or decrease the tension ofthe spring N on a pad-Fl. a

The ears 32, 32 do not extend downward from a curved neck 30 in U-shapebut curve down and around so that their free ends 35 almost touch toform an 0. The head 3| and ears therefore have nothing to catch or bind,but can move freely in the top bearing hole 33.

If the springs N, N, or, if a single spring is used, the spring N ispositioned approximately midway between such a head 3| and the pin hole22 through which a pin P fits with an easy sliding fit( each pad F canslide towards and away from the other or can rock enough to accommodateitself to any inequalities of filling thread and any position near thetop, mid dle or bottom through which the thread passes V To prevent thethreat from catching between the pin hole 22 and pin P, or being pinchedas each pad F rocks, we round the inner or friction side edge 26 of eachhole 22 onthe friction side 20 and this forms the base of a ,rim 25.This forms a rounded edge tubular pin hole.

The hole 22 is not punched but it and rim 25 are formed by a specialtool and by an extrudingprocess so that this tubular pin hole, on itsouter or holding side edge 21 does not have a sharp cutting edge, as itdoes when a pin hole. is punched, but is dull as shown in Fig. 3.However even if rim edge 21 is sharp, the rounded inner edge 26 preventsbinding and permits a certain amount of rocking without wearing the pinP and even when the thread is threading or running from the bottom of acone of thread near the bobbin tip as shown by the bottom, dotted linesT2 in Fig. l, the wear is much less than in the usual construction. Whenthe thread runs anywhere between Tl and T2, the pads F, F move easilywith or against a spring N with no binding and little wear as each pad Fhas a tubular inside bearing member 3| at the top and at the bottom atubular outside bearing member 25 which are parallel and each of whichfits its holding means, hole 33 and pin P, with a smooth running fit.

In a common or standard size of shuttle, the

diameter of the inside of hole 22 should be about .01 of an inch greaterthan that of pin P, and the outside diameter of head 3| is from .01 to.03 less than the diameter of head bearing hole 33.

We claim:

1. The combination in a shuttle provided with a threading block with athreading slot extending down from the top, having on one side near thetop of a cylindrical head bearing hole and near the bottom, a holdingpin; of a metal friction pad of thin metal which has a high, narrowsubstantially flat face on the friction side, wings between the top andbottom which extend back each from an edge of the flat face towards aholding side, a neck at the top which curves back at the holding sidecarrying integral downwardly extending cars which are curved toward eachother to form a substantially tubular bearing head, and a tubular pinhole near the bottom of each pad with a rounded edge on the frictionside and a rim projecting on the holding side parallel with the head,the edge of the projecting rim on the holding side being dull, so as toform a rounded edge tubular holding pin hole; with a compression springpositioned between the tubular bearing head and the tubular holding pinhole.

2. A metal friction pad for loom shuttles of thin metal which has ahigh, narrow substantially fiat face on the friction side, wings betweenthe top and bottom which extend back each from an edge of the fiat facetowards a holding side, a neck at the top which curves back at theholding side carrying integral downwardly extending ears which arecurved toward each other to form a substantially tubular bearing headand a tubular pin hole near the bottom. of each pad with a rounded edgeon the friction side and a rim projecting on the holding side parallelwith the head, the edge of the projecting rim on the holding side alsobeing dull so as to form a rounded edge tubular pin hole.

3. A metal friction pad for loom shuttles of thin metal which has ahigh, narrow substantially fiat face on the friction side, wings betweenthe top and bottom which extend back each from an edge of the flat facetowards a holding side, a neck at the top which curves back at theholding side carrying integral downwardly extending ears which arecurved toward each other to form a substantially tubular bearing headand a tubular pin hole near the bottom of each pad with a rounded edgeon the friction side and a rim projecting on the holding side parallelwith the head, so as to form a rounded edge tubular pin hole.

4. A metal friction pad for loom shuttles of thin metal which has ahigh, narrow, flat face on the friction side, wings between the top andbottom which extend back each from an edge of the flat face towards aholding side, a neck at the top which extends back at the holding sidecarrying integral downwardly extending cars which are curved toward eachother to form a substantially tubular bearing head and a tubular pinhole near the bottom of each pad with a rounded edge on the frictionside and a rim projecting on the holding side parallel with the head, soas to form a rounded edge tubular pin hole.

JAMES E. SEGEE. WILFRID J. GOSSELIN.

No references cited.

